سنگ‌نگاری و شیمی کانی گابروهای دگرنهاد شده افیولیت انارک

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه اصفهان

چکیده

افیولیت انارک به سن دیرینه زیستی با روند شرقی - غربی در شمال شهر انارک واقع است. علاوه بر گابروهای موجود در توالی افیولیتی انارک، توده­هایی از گابروهای دگرنهاد شده به شکل استوک و دایک درون افیولیت انارک نفوذ کرده­اند. گابروهای دگرنهاد شده جوانتر از افیولیت انارک و قدیمی­تر از مجموعه دگرگونی انارک بوده و دربردارنده کانی­های دیوپسید و اوژیت، هورنبلند اکتبنولیتی، اکتینولیت، ترمولیت، فلوگوپیت، آلبیت و الیگوکلاز، پیکنوکلریت و پنینیت، اپیدوت، گارنت، اسفن، آپاتیت، پرهنیت، کلسیت و کانی­های کدر هستند. نفوذ آب دریا تا پوسته زیرین و گوشته بالایی باعث دگرنهادی دمای بالای گابروها شده است. ناهنجاری مثبت Pb و ناهنجاری منفی Ti, Nb, Ta در شیمی سنگ کل و کلینوپیروکسن و آمفیبول نشانگر محیط زمین­ساختی قوس آتشفشانی وابسته به مناطق فرورانش است. دمای تبلور دیوپسید 1150 تا 1200، فلوگوپیت 750، هورنبلند اکتینولیتی. 600، کلریت 360-540 و اکتینولیت 450 درجه سانتیگراد است.    

کلیدواژه‌ها

عنوان مقاله [English]

Petrography and mineral chemistry of metasomatized gabbros from the Anarak Ophiolite

چکیده [English]

The Anarak ophiolite, with E-W trending, located at north of Anarak. In addition to the gabbros in Anarak ophiolite sequence, intrusion of metasomatized gabbros injected into the ophiolite of Anarak in the form of stocks and dykes. metasomatized gabbros are younger than Anarak ophiolite and older than Anarak metamorphic assemblage and contain diopside, augite, actinolitic hornblende, actinolite, tremolite, phlogopite, albite, oligoclase, pycnochlorite, penninite, epidote, garnet, sphene, prehnite, calcite and opaque minerals. Penetration of seawater into the lower crust and upper mantle led to high temperature matasomatism in the gabbros. Positive Pb anomaly and negative Ta,Nb and Ti anomalies in whole rock and minerals chemistry of clinopyroxene and amphibole are markers of volcanic arc tectonic environments and association with subduction zones. Crystallization temperatures of diopside, phlogopite, actinolitic hornblende, actinolite and chlorite are 1150-1200 °C, 750 °C, 600 °C, 450 °C and 360-540 °C respectively.

کلیدواژه‌ها [English]

  • Mineral chemistry
  • whole rock chemistry
  • Gabbro
  • metasomatism
  • ophiolite
  • Anarak

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  • تاریخ دریافت: 13 خرداد 1396
  • تاریخ بازنگری: 15 مهر 1396
  • تاریخ پذیرش: 01 آبان 1396

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